A polystyrene-oligothiophene-polystyrene triblock copolymer
| Autor: | Martin Möller, John A. E. H. van Haare, E. W. Meijer, Spatz Joachim P, Sergei S. Sheiko, Mark A. Hempenius, B.M.W. Langeveld-Voss, René A. J. Janssen |
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| Přispěvatelé: | Macromolecular and Organic Chemistry, Molecular Materials and Nanosystems, Macro-Organic Chemistry |
| Jazyk: | angličtina |
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Size-exclusion chromatography General Chemistry Nuclear magnetic resonance spectroscopy Polymer Biochemistry Catalysis chemistry.chemical_compound Colloid and Surface Chemistry chemistry Transmission electron microscopy Reagent Polymer chemistry Copolymer Thiophene Polystyrene |
| Zdroj: | Journal of the American Chemical Society, 120(12), 2798-2804. American Chemical Society Journal of the American Chemical Society |
| ISSN: | 0002-7863 |
| Popis: | A well-defined triblock copolymer is synthesized by using a strategy in which the α-coupling of 11 thiophene rings of the middle block and the monodispersity (DP = 30 and M̄w/M̄n = 1.1) of the two polystyrene outer blocks is ensured. Monofunctional polystyrene 1 is first modified with an α-terthiophene unit 2 to form 3, and two of these units are coupled in a double Stetter reaction of 4 with a difunctional α-terthiophene 5 to yield a tetraketone 6 as the precursor of the triblock copolymer, which was formed with excess Lawesson's reagent. The polymer 7 is fully characterized with IR and NMR spectroscopy and MALDI-TOF mass spectrometry. Size exclusion chromatography, transmission electron microscopy, and scanning force microscopy show that 7 is self-assembled into spherical, micellar structures with average diameters of 12 nm, which corresponds to about 60 block copolymer molecules per aggregate. The optical properties of 7 are in full agreement with an associated unsubstituted oligothiophene. Electrochemical doping is hampered by the polystyrene shell; however, chemical doping afforded small nanoscopic charged aggregates that are soluble in organic solvents. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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